| What it does | Solve everyday tasks quickly with AI using browser-based online tools
| Test your visual reaction time for free
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| Stage | Not given
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| Founded | 2022
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| Based in | JP
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| Pricing model | Freemium
| Free
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| Pricing | Free plan: all tools available with daily task limits; Pro plan: ¥1,320/month or ¥15,840/year (33% off annual); AI credits: ¥1 per credit, purchases from ¥100-¥10,000 in ¥100 increments, valid for 6 months.
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| Key features | - PDF compression and editing (merge, split, rotate, add page numbers, headers, footers, watermarks, digital stamps, password protection)
- Image conversion and processing (HEIC, SVG, WebP, PNG, JPG formats)
- OCR and text recognition (image text extraction, handwriting recognition, receipt scanning)
- QR code and barcode tools (creation and scanning)
- Markdown conversion from multiple file formats
- Browser-based processing with privacy protection
| - Five-round visual reaction test with millisecond timing
- Seven-round sound reaction time test
- Local result history with up to 300 sessions stored
- Consistency measurement showing standard deviation of scores
- Download score card as image
- Sound calibration for personal offset adjustment
- Reference data from published research studies
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| What makes it different | - Privacy-first design with most file processing completed entirely in the browser without server upload
- Completely free with all tools available, registration requires only email address with no password needed
- Comprehensive toolset with 100+ tools across PDF, image, text, and AI categories in single platform
- Optimized for Japanese users with Japanese language support and culturally relevant features
- Single Pro subscription provides unlimited daily task limits for all tools plus ad-free experience
| - No account or login required to use the test
- Results stored locally in browser for privacy
- Compare full sessions to understand consistency, not just fastest round
- Research-backed reference data from laboratory studies
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| Free plan | Not given
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| Open source | Not given
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| Platforms | Not given
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| Public API | Not given
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 8 ▲ +1 (up) since last check | 3 ● no change since last check |
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| Trust Flow (Majestic) | 12 | 0 |
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| Citation Flow (Majestic) | 28 | 11 |
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| Referring domains (Majestic) | 43 | 1 |
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sakuttoAI
ReactionTests